Rose Broome and her HandUp website use technology to form a link between people in need and those who want to help them.

Rose Broome and her HandUp website use technology to form a link...

It was a bone-chilling winter night in San Francisco, and Rose Broome stood at the corner of Church and Market streets, cupping her gloved hands over her mouth. That's when she saw her. In the doorway of a real estate office, a homeless woman sat shivering, in thin clothes. Not an uncommon sight in this city, but the irony of that image ate away at Broome, a self-described "digital native" who was a data analyst for a self-improvement startup that offered games to help users lose weight, get over breakups or cope with illness.

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